125 *20+125 *(x ^100) *80=100*(1+15% )
    { 0.5x+18 }{ 0.5x-18 } = { 74 }{ 65 }
    49z^2+95*36-24*36z=0
    45z^2+95*32-24*32z=0
    35-X＝4(X+5)
    9830.79+(9830.79+X)*1.1*1.003*0.003+X=39508.46
    70538.96+(70538.96+X)*1.1*1.003*0.003+X=99122.78
    2x=3÷3x+6
    23+5x=3x-6
    100*x*222.64/(x*222.64+(1-x)*0.5*335.17)=90.355
    1800-X+135=400
    x（x-1）=-0.184
    x^4-x^3
    X*(X+1)*(25+X/20)=490000
    X*(X+1)*(25+X/20)=1050000
    25%=（X×2.5×1×0.4）/（1-X×2.5×1×0.4）
    x×x+50x-30000
    n(n+1)=1000
    1.427*2100+112.6=1.425*500+1.420*400+1.418*400+1.435*400+x*400
    x^2＋50x－275 = 0

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